I've not been there myself, but according to a COSEWIC report on the
species it occurs on the south shore of Manitoulin.
Sean Z
Quoting Chuck Chapman <i*@aim.com>:
> I haven't seen any lacustris on Manitoulin Island. Lots on
> Georgian Bay , which could be considered west part of Bruce
> Peninsula.
>
> Where it is found, it is often in massive clumps. I have seen clumps
> about 75 feet long, by 10 feet across. Solid mass.
>
> Have always seen it close to shoreline. The farther north on
> Georgian Bay, the less colonies are found.
>
> If you have any more specific information re Manitoulin Island
> colonies I could check it out
>
> Chuck Chapman
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> ---- Original Message ----
> From: Sean A. Zera <z*@umich.edu>
> To: i*@yahoogroups.com
> Sent: Sat, Jun 25, 2011 12:15 pm
> Subject: Re: [iris-species] ID please
>
>
>
>
>
> It looks like Iris lacustris to me. There is hardy any genetic
> variation in this species, and with the exception of f. alba, they all
> look pretty much the same. Seed set is low in the wild, and many
> colonies are large vegetative clones. The assumption is that I.
> lacustris is derived from a single northward colonization event by I.
> cristata, the normal range of which is about 500 km south at its
> closest.
>
> I. lacustris mostly occurs here:
> http://www.michigan.gov/images/dwarf_iris_distribution_57509_7.jpg
>
> as well as in small numbers on the adjacent Door Peninsula in
> Wisconsin and Manitoulin Island and the Bruce Peninsula in Ontario.
> The isolated southernmost population near Milwaukee is extirpated.
>
> The range of I. cristata, widespread south of the glacial maximum:
> http://flora.huh.harvard.edu/FloraData/001/Map/26/iris_cristata.jpg
>
> Despite being restricted to limestone pavement or sand dunes along
> Lake Michigan and Lake Huron (but not Lake Superior) in the wild, it
> seems to do just fine in garden conditions that suit I. cristata.
>
> Sean Z
> Zone 5b/6a
> SE Michigan
>
> Quoting Robert Pries <r*@embarqmail.com>:
>
>>
>>
>> My first thought is that this is lacustris. Some botanists have
>> placed lacustris as a subspecies of cristata because they are very
>> very similar. Generally lacustris is much smaller and confined to a
>> small region around Lake Superior and Lake Michigan. But there are
>> very small forms of cristata in limited locations in the Southern
>> USA that would be very hard to tell from the classic lacustris. Good
>> to hear from you Yuri, Sincerely Bob Pries
>>
>>
>> ----- Original Message -----
>> From: "Yuri Pirogov" <j*@aha.ru>
>> To: i*@yahoogroups.com
>> Sent: Friday, June 24, 2011 4:08:35 AM
>> Subject: [iris-species] ID please
>>
>>
>>
>>
>>
>>
>>
>> Is this beauty Iris lacustris or Iris cristata?
>>
>> Yuri
>> in Moscow
>>
>>
>>
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